Shareholders in Carl Zeiss Meditec (ETR:AFX) are in the red if they invested three years ago

If you are building a properly diversified stock portfolio, the chances are some of your picks will perform badly. But long term Carl Zeiss Meditec AG (ETR:AFX) shareholders have had a particularly rough ride in the last three year. Sadly for them, the share price is down 63% in that time. Furthermore, it's down 14% in about a quarter. That's not much fun for holders.

Now let's have a look at the company's fundamentals, and see if the long term shareholder return has matched the performance of the underlying business.

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To quote Buffett, 'Ships will sail around the world but the Flat Earth Society will flourish. There will continue to be wide discrepancies between price and value in the marketplace...' One imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

During the three years that the share price fell, Carl Zeiss Meditec's earnings per share (EPS) dropped by 16% each year. This reduction in EPS is slower than the 28% annual reduction in the share price. So it's likely that the EPS decline has disappointed the market, leaving investors hesitant to buy.

The image below shows how EPS has tracked over time (if you click on the image you can see greater detail).

This free interactive report on Carl Zeiss Meditec's earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

Carl Zeiss Meditec shareholders are down 18% for the year (even including dividends), but the market itself is up 22%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 7% per year over five years. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. Consider for instance, the ever-present spectre of investment risk. We've identified 2 warning signs with Carl Zeiss Meditec , and understanding them should be part of your investment process.

If you would prefer to check out another company -- one with potentially superior financials -- then do not miss this free list of companies that have proven they can grow earnings.

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on German exchanges.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.